I don't want to defend anything anymore, but just answer some question, maybe they are stupid questions.
So the security forces scares her father and relatives, instead of backing down, she "speaks out." China has been known to go ahead with imprisonment regardless of what the Western establishment says, this is hardly a smart move.
Second, the Chinese internal security has a lot of experience, what did they expect her to do? Even if she backs down now it would look like she's being threatened anyways, which makes this dumb move either way. Especially since from the looks of it, she didn't get any instructions on how to construct a story.
Chinese agents by now should know Westerners are willing to believe anything negative about China, why rock the boat when....
Third, Miss World, what the hell is that, her "human rights" movie is so insignificant, 10 google search later, still no result. BTW I'm in Canada. I would have never heard of her, almost everyone would have never heard of her, even now most people still don't know her, why do this? Or how did the Chinese agents know about her?
Fourth, she even admits partly that she got it because she's "outspoken" against China. Incentive.
Fifth, even if China did want to stop her, there's a hundred ways to do it far easier and cleaner, why go through the stupidest way possible. Again refer to Westerners would believe anything negative on China, so making it seem implausible is out, since nobody other than a few would think so.
China isn't innocent, but so far it has proven, it isn't stupid. This would be a stupid move. Who's more likely to be stupid? Her? Or the entire Chinese security establishment.